Lead DBA

Lead DBA Interview Questions and Answers

Updated 13 Nov 2022
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Q1. What is your name ? And how you build our slow old system.

Ans.

My name is John Smith. I improved the slow old system by optimizing queries, upgrading hardware, and implementing performance tuning techniques.

  • Optimized database queries by rewriting them and adding appropriate indexes

  • Upgraded hardware to improve system performance

  • Implemented performance tuning techniques such as caching and query optimization

  • Identified and resolved bottlenecks in the system

  • Implemented database monitoring and alerting to proactively address performance issue...read more

Q2. What is rational database, etc..

Ans.

A relational database is a type of database that organizes data into tables with rows and columns.

  • A relational database is based on the relational model, which uses tables to store and organize data.

  • Tables consist of rows and columns, where each row represents a record and each column represents a field or attribute.

  • Data in a relational database is structured and can be easily accessed and manipulated using SQL (Structured Query Language).

  • Relationships between tables are esta...read more

Q3. What is sql

Ans.

SQL stands for Structured Query Language, used to manage and manipulate relational databases.

  • SQL is a programming language used to manage and manipulate relational databases.

  • It is used to create, modify, and query databases.

  • SQL is used in various applications such as web development, data analysis, and business intelligence.

  • Examples of SQL-based database management systems include MySQL, Oracle, and Microsoft SQL Server.

Q4. Types of db

Ans.

There are mainly four types of databases: relational, NoSQL, column-family, and document.

  • Relational databases store data in tables with predefined relationships between them.

  • NoSQL databases are non-relational and can handle unstructured data.

  • Column-family databases store data in columns instead of rows.

  • Document databases store data in documents, usually in JSON format.

  • Examples of relational databases include MySQL and Oracle.

  • Examples of NoSQL databases include MongoDB and Cas...read more

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